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  • Analgesics  (1)
  • psammic  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 60 (1978), S. 25-28 
    ISSN: 1432-2072
    Keywords: Experimental pain ; Analgesics ; Anileridine ; Amphetamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The separate and combined analgesic effects of 10 mg of oral amphetamine sulfate and 25 mg of oral anileridine dihydrochloride were studied in 24 healthy, adult, male volunteers. Tolerance of progressively increasing pain produced by the Submaximum Effort Tourniquet Technique was tested four times in each subject: after amphetamine, after anileridine, after the combination, and after a matching placebo. Treatments were administered double blind and in counterbalanced order. Elapsed time to report of slight, moderately distressing, very distressing, and unbearable pain was recorded on each trial. The four oral treatments differed significantly for very distressing and for unbearable pain. At each of the three upper pain levels, the mean tolerance times for anileridine and amphetamine were similar; each was longer than placebo but shorter than the combination; and the effect of the combination was approximately the sum of the effects of the two components.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 108 (1984), S. 105-114 
    ISSN: 1573-5117
    Keywords: ecology ; Rotifera ; population dynamics ; acid mine drainage ; stream ; psammic ; canonical correlation ; Ohio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The psammic rotifer community inhabiting the bottom of a second order stream partially under the influence of acid mine drainage was studied from May, 1978 to November, 1979. Thirty-one species of rotifers were found, but abundances were very low (range 0.0 to 8.6 cm-3). Total rotifer density and densities of major genera differed significantly over time, among sites and between depths in the sediment (P 〈 .01). Highest densities occurred in the top 1 cm of sediment during periods of stream stability in the late summer and fall. Total rotifer density and densities of Lecane spp., Cephalodella spp. and Trichocerca spp. were positively correlated with alkalinity and negatively correlated with manganese (canonical correlation, p 〈 .05). Densities of all taxa were negatively correlated with variability in water chemistry. Total rotifer density was found to be positively correlated with minimum monthly temperature (r = 0.6, P 〈. 05) and to lag behind the temperature cycle by 6 weeks. Rotifer species were found to be randomly distributed in time and space with no evidence which might suggest competitive exclusion. A highly variable and unpredictable environment is thought to keep density and diversity low in this community.
    Type of Medium: Electronic Resource
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